/* ==========================================
   OIKOS - Smart Expense Manager
   Landing Page Styles
   ========================================== */

/* CSS Custom Properties */
:root {
    /* Foundation Colors */
    --color-black: #0a0a0a;
    --color-white: #fafafa;

    /* Gray Scale */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Primary - Rose */
    --color-rose: #a85751;
    --color-rose-light: #f5e6e5;
    --color-rose-dark: #8b3d38;

    /* Accent Colors */
    --color-blue: #3b82f6;
    --color-blue-light: #dbeafe;
    --color-purple: #8b5cf6;
    --color-purple-light: #ede9fe;
    --color-teal: #14b8a6;
    --color-teal-light: #ccfbf1;
    --color-amber: #f59e0b;
    --color-amber-light: #fef3c7;
    --color-green: #22c55e;
    --color-green-light: #dcfce7;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-black);
    background: var(--color-white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ==========================================
   NAVIGATION
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-4) 0;
    background: transparent;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-black);
}

.logo-icon {
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-black);
}

.nav-cta {
    padding: var(--space-2) var(--space-5);
    background: var(--color-rose);
    color: var(--color-white) !important;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.nav-cta:hover {
    background: var(--color-rose-dark);
    transform: translateY(-2px);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-black);
    transition: all var(--transition-fast);
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    position: relative;
    min-height: 100vh;
    padding: var(--space-32) 0 var(--space-16);
    overflow: hidden;
}

.hero-bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(180deg, var(--color-rose-light) 0%, var(--color-white) 50%);
    z-index: -1;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.hero-content {
    max-width: 560px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--space-6);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 900;
    line-height: 1;
    margin-bottom: var(--space-4);
}

.title-oikos {
    background: linear-gradient(135deg, var(--color-rose), var(--color-rose-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--space-4);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: var(--space-8);
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-10);
}

.hero-stats {
    display: flex;
    gap: var(--space-10);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-black);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

/* Hero Phone */
.hero-phone {
    display: flex;
    justify-content: center;
}

.phone-frame {
    position: relative;
    width: 280px;
    height: 580px;
    background: linear-gradient(145deg, #1a1a1a, #0a0a0a);
    border-radius: 40px;
    padding: 12px;
    box-shadow:
        0 50px 100px -20px rgba(0, 0, 0, 0.3),
        0 30px 60px -30px rgba(0, 0, 0, 0.4);
}

.phone-frame.small {
    width: 200px;
    height: 420px;
    border-radius: 28px;
    padding: 8px;
}

.phone-notch {
    position: absolute;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: 90px;
    height: 26px;
    background: #0a0a0a;
    border-radius: 16px;
    z-index: 20;
}

.phone-frame.small .phone-notch {
    width: 60px;
    height: 18px;
    top: 12px;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--color-gray-900);
    border-radius: 28px;
    overflow: hidden;
}

.phone-frame.small .phone-screen {
    border-radius: 20px;
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Doodles */
.doodle {
    position: absolute;
    pointer-events: none;
    opacity: 0.4;
}

.doodle-circle-1 {
    top: 20%;
    left: 5%;
    width: 80px;
    height: 80px;
    border: 2px dashed var(--color-rose);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.doodle-circle-2 {
    bottom: 15%;
    right: 8%;
    width: 120px;
    height: 120px;
    border: 2px solid var(--color-purple);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite reverse;
}

.doodle-star-1 {
    top: 30%;
    right: 15%;
    font-size: 2rem;
    color: var(--color-amber);
    animation: twinkle 3s ease-in-out infinite;
}

.doodle-star-2 {
    bottom: 25%;
    left: 10%;
    font-size: 1.5rem;
    color: var(--color-teal);
    animation: twinkle 4s ease-in-out infinite 1s;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--color-rose);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-rose-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(168, 87, 81, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--color-black);
    border: 2px solid var(--color-gray-200);
}

.btn-secondary:hover {
    border-color: var(--color-black);
    background: var(--color-gray-50);
}

.btn-white {
    background: var(--color-white);
    color: var(--color-black);
}

.btn-white:hover {
    background: var(--color-gray-100);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
}

.btn-large {
    padding: var(--space-5) var(--space-8);
    font-size: 1rem;
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
}

.btn-small {
    font-size: 0.75rem;
    font-weight: 400;
}

.btn-big {
    font-size: 1.125rem;
    font-weight: 700;
}

/* ==========================================
   SECTION STYLING
   ========================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-4);
    color: var(--color-black);
}

.title-accent {
    background: linear-gradient(135deg, var(--color-rose), var(--color-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-500);
    max-width: 500px;
    margin: 0 auto;
}

/* ==========================================
   FEATURES SECTION
   ========================================== */
.features {
    padding: var(--space-24) 0;
    background: var(--color-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

.feature-card {
    position: relative;
    padding: var(--space-8);
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-base);
}

.feature-badge {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    padding: var(--space-1) var(--space-3);
    background: var(--color-purple-light);
    color: var(--color-purple);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-large {
    grid-column: span 2;
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-5);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.icon-rose {
    background: var(--color-rose-light);
    color: var(--color-rose);
}

.icon-purple {
    background: var(--color-purple-light);
    color: var(--color-purple);
}

.icon-teal {
    background: var(--color-teal-light);
    color: var(--color-teal);
}

.icon-amber {
    background: var(--color-amber-light);
    color: var(--color-amber);
}

.icon-green {
    background: var(--color-green-light);
    color: var(--color-green);
}

.icon-blue {
    background: var(--color-blue-light);
    color: var(--color-blue);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--space-3);
}

.feature-description {
    font-size: 1rem;
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: var(--space-4);
}

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag {
    padding: var(--space-1) var(--space-3);
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
}

/* ==========================================
   SCREENSHOTS SECTION
   ========================================== */
.screenshots {
    padding: var(--space-24) 0;
    background: var(--color-gray-50);
}

.screenshots-carousel {
    overflow-x: auto;
    padding: var(--space-4) 0;
    margin: 0 calc(-1 * var(--space-6));
    padding-left: var(--space-6);
    scrollbar-width: none;
}

.screenshots-carousel::-webkit-scrollbar {
    display: none;
}

.carousel-track {
    display: flex;
    gap: var(--space-6);
}

.screenshot-item {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.screenshot-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-600);
}

/* ==========================================
   BANKS SECTION
   ========================================== */
.banks {
    padding: var(--space-24) 0;
    background: var(--color-white);
}

.banks-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-8);
}

.bank-category-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--space-4);
}

.bank-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.bank-item {
    padding: var(--space-2) var(--space-4);
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.bank-item:hover {
    background: var(--color-rose-light);
    color: var(--color-rose-dark);
}

.bank-item.upi {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--color-teal-light);
    color: var(--color-teal);
}

.upi-list {
    flex-direction: column;
}

.banks-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4);
    background: var(--color-blue-light);
    color: var(--color-blue);
    font-size: 0.875rem;
    border-radius: var(--radius-lg);
}

/* ==========================================
   TECH STACK SECTION
   ========================================== */
.tech-stack {
    padding: var(--space-16) 0;
    background: var(--color-gray-900);
    color: var(--color-white);
}

.tech-stack .section-tag {
    color: var(--color-gray-400);
}

.tech-stack .section-title {
    color: var(--color-white);
}

.tech-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
}

.tech-item {
    padding: var(--space-3) var(--space-6);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.tech-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.tech-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-300);
}

/* ==========================================
   DOWNLOAD CTA SECTION
   ========================================== */
.download-cta {
    position: relative;
    padding: var(--space-24) 0;
    background: linear-gradient(135deg, var(--color-rose), var(--color-rose-dark));
    overflow: hidden;
}

.cta-content {
    position: relative;
    z-index: 10;
    text-align: center;
}

.cta-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.cta-subtitle {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-8);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-10);
}

.cta-features {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-6);
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    font-weight: 500;
}

.cta-doodles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.cta-doodle {
    position: absolute;
    font-size: 2.5rem;
    opacity: 0.2;
    color: var(--color-white);
}

.cta-doodle-1 {
    top: 15%;
    left: 10%;
    animation: float 5s ease-in-out infinite;
}

.cta-doodle-2 {
    bottom: 20%;
    right: 15%;
    animation: twinkle 4s ease-in-out infinite;
}

.cta-doodle-3 {
    top: 60%;
    right: 25%;
    font-size: 4rem;
    animation: float 6s ease-in-out infinite reverse;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--color-gray-900);
    color: var(--color-gray-300);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-12);
}

.footer-logo {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: var(--space-2);
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    margin-bottom: var(--space-2);
}

.footer-by a {
    color: var(--color-rose);
    transition: color var(--transition-fast);
}

.footer-by a:hover {
    color: var(--color-white);
}

.footer-links h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-800);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.footer-tagline-small {
    font-style: italic;
}

/* ==========================================
   ANIMATIONS
   ========================================== */
@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

@keyframes twinkle {

    0%,
    100% {
        opacity: 0.2;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.2);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.animate-fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

.animate-slide-up {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp 0.8s ease forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-phone {
        order: -1;
        margin-bottom: var(--space-10);
    }

    .feature-large {
        grid-column: span 1;
    }

    .banks-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding-top: var(--space-24);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: var(--space-6);
    }

    .phone-frame {
        width: 240px;
        height: 500px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta-features {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }

    .phone-frame {
        width: 220px;
        height: 460px;
        border-radius: 32px;
    }

    .doodle {
        display: none;
    }
}